8 neutrons

Carbon-14: with 6 protons and 8 neutrons, and an atomic mass of 14.

six neutrons

FIVE isotopic forms of the element carbon are known, having atomic weights ranging from 10 to 14. Two of them, C12 and C13, exist stably in Nature, while the others are radioactive, and are known to us only through their production in various nuclear reactions.

C and 13C are stable, occurring in a natural proportion of approximately 93:1. C is produced by thermal neutrons from cosmic radiation in the upper atmosphere, and is transported down to earth to be absorbed by living biological material.

Carbon-13 (13C): The carbon isotope whose nucleus contains six protons and seven neutrons. This gives an atomic mass of 13 amu. six neutrons, resulting in an atomic mass of 12 amu.

The nucleus of carbon 14 contains 6 protons and 8 neutrons, as opposed to the 6 and 6 found in ordinary carbon 12. The imbalance makes carbon 14 a radioisotope with a half-life of 5,700 years, and an emitter of beta particles. This radioactive isotope of carbon is called radiocarbon.

There is only one stable atom that does not have neutrons. It is an isotope of the element hydrogen called protium. Protium, which contains a single proton and a single electron, is the simplest atom.

Properties. Neutron matter is equivalent to a chemical element with atomic number 0, which is to say that it is equivalent to a species of atoms having no protons in their atomic nuclei. Neutron matter decays quickly into hydrogen.

Hydrogen

Consider helium again. Most helium atoms have two neutrons in addition to two protons. Therefore the mass of most helium atoms is 4 atomic mass units (2amu for the protons + 2amu for the neutrons)….Mass Number.

Antimony –

A neutron can exist on its own just fine, it just won’t exist very long. With a half-life of about 10 minutes, neutrons decay into protons, electrons, and antielectron-neutrinos.

To keep neutronium in its neutronium form you’d need the mass of about two suns packed into a sphere of about 10 miles diameter… in other words, you’d need to have a neutron star. So no, you can’t just remove a little bit and take it home, set it on your desk, and enjoy the warming blue glow.

Deep, dark mystery. Neutron stars get more complicated the deeper one goes. Beneath a thin atmosphere made mostly of hydrogen and helium, the stellar remnants are thought to boast an outer crust just a centimetre or two thick that contains atomic nuclei and free-roaming electrons.

TL;DR: there are no electron or proton stars because there is not enough energy in the universe to form them.

James Chadwick

Joseph John Thomson

Ernest Rutherford’s

Discovery of Electrons, Protons and Neutrons

Anode ray